V90/XC90/S90 HK AUD .VBF Files

[IMAY2023]

DO NOT DO IT! Your AUD will turn into brick! 
I tried the opposite way! My first AUD (B&W) came from S90 and I tried to load B&W S60 software on it to make my tweeters work.  
At the end, AUD does not even load and turned into brick. Now I am trying to find s90 software to rescue it. 

Although the the part numbers are all the same, most likely the AUD flash procedure requires config file to over write output configuration of the AUD similar to HCM (headlight controller). At the end of the day flashed software must match to the stored output configuration of the AUD. 

You have two options. 
1) Find an another AUD from any 90 series.
2) You need to connect your MIDs and Tweeters in parallel to the woofer.

Interesting. So you found the .vbf file for a 60 series and flashed it to the 90 series AUD?

I'm not that familiar with HCM / headlight swapping. But I thought if you were installing headlights from a different car you could flash to change the configuration?

Well this is discouraging.  I feel like it must be possible since if I wanted to buy a new HK/K504 Amplifier from Volvo for my 2018 V90CC the appropriate AUD is PN 36003062 / HW 31456942. And these numbers are the exact same on HK/K504 AUD I got from a donor 2019 XC60. If the PN/HW numbers are the same it must be software that determines which channels/pins are active on the AUD.

Buying a brand new AUD is very different than buying a used one from different series.  Brand new ones do not have any software nor configuration inside and the  AUD is the same HW part number across all series.  It's even possible to upgrade from HK to B&W AUD officially if you buy the AUD brand-new.  The AUD reload software called AUD exchange. This was the case last year for my 2019 S60 when I asked the volvo dealership after bricking my first used B&W AUD.   So, I think it should be possible to load the 90 series software into a brand new AUD via Orbit.  

But you said, your car is V90 and you got used HK AUD from 60 which has a different output configuration (does not have MID+HIGH channels on rear doors) than 90 series has and you wanted to load 90 series software on the used 60 series AUD.  

Besides, it's not only those numbers, you also have (below) check and compare that too between HK 90 series and HK 60 series. 
SWP1_Local Configuration Parameters: 31489579 AB